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Accumulated Other Comprehensive Loss - Changes in components of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Loss
Balance	$ 5,533,098	$ 5,074,927	$ 4,802,940
Net comprehensive income (loss)	(24,385)	94,552	(655,942)
Balance	5,890,415	5,533,098	5,074,927
Benefit Plans
Accumulated Other Comprehensive Loss
Balance	627	(673)	57
Other comprehensive income (loss) before reclassifications	(83)	1,086	(838)
Amounts reclassified from accumulated other comprehensive loss	34	214	108
Net comprehensive income (loss)	(49)	1,300	(730)
Balance	578	627	(673)
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Loss
Balance	(583,163)	(676,415)	(21,203)
Other comprehensive income (loss) before reclassifications	(24,374)	93,285	(655,189)
Amounts reclassified from accumulated other comprehensive loss	38	(33)	(23)
Net comprehensive income (loss)	(24,336)	93,252	(655,212)
Balance	(607,499)	(583,163)	(676,415)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Balance	(582,536)	(677,088)	(21,146)
Other comprehensive income (loss) before reclassifications	(24,457)	94,371	(656,027)
Amounts reclassified from accumulated other comprehensive loss	72	181	85
Net comprehensive income (loss)	(24,385)	94,552	(655,942)
Balance	$ (606,921)	$ (582,536)	$ (677,088)

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